Manual Robbe Futaba FX-40 (page 90 of 105) (English)

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Model menu

Auto-rotation

FX-40

19.4 AUTO-ROTATION SETTINGS

This option is used for entering the settings for auto-rotation,

so that the motor either stops or idles when the ‘Auto-r

otation’

flight mode (TH-HOLD) is selected, regardless of the position

of the throttle stick. Two independent settings - motor off and

idle - can be entered. It is advisable to use the ‘Idle’ mode for

practising auto-rotation landings. Either of the auto-rotation

modes can be activated using switches which you can select

freely.

With the ‘Helicopter’ model type already selected, mark this

option in the Model menu. The screen now looks like this:

The screen displays two separate frames for the auto-rotation

settings, i.e. ‘motor stopped’ and ‘idle’. In the left frame you

can enter the settings for a cut (stopped) motor, while the right

frame contains those for the motor at idle. Both sets of values

are entered in exactly the same way. The only item which dif-

fers is the term ‘Off Pos.’ for motor cut, which changes to ‘Idle

Offs.’ for the idle option. In the first display the Offset point for

automatic mode is displayed in graphic bar form. The follo-

wing description therefore covers both frames, but we will

concentrate on the ‘Motor off’ mode in the following example.

The first step is to activate this option in the familiar fashion:

simply mark the Status line in the standard way, and the dis-

play changes from ‘INA’ to ‘ON’. After this you can select

‘Glob’ or ‘Sepa’ mode.

You can now enter the Auto-rotation mode in the second line.

Two different modes are available:

Manual: Manual mode

Auto: Automatic mode

In manual mode the auto-r

otation flight mode is only trigger

when a (freely selectable) switch is operated. In automatic

mode, the auto-rotation flight mode is triggered by the position

of the throttle stick. In the latter case it is necessary to define

the trigger point: move the throttle stick to the desired posi-

tion, and mark the ‘Off Pos.’ field. The software stores the trig-

ger position, and displays it as a percentage value in the

appropriate field and in bar form on the right of the display

frame.

This screen shot shows a set-up with an automatic position

programmed for both ranges: ‘Motor off’ and ‘Idle’.

The next step is to set the carburettor position for auto-rota-

tion, in the form of a percentage figure in the ‘Off Pos.’ or ‘Idle

Offs.’ line. In ‘Off’ mode the motor is shut down completely, so

the servo travel should be set accordingly. In ‘Idle’ mode the

carburettor setting should be selected to move the motor to

idle at a reliable but not excessively high speed. In both cases

mark the field, and enter the required setting using the arrow

buttons. The adjustment range is 0% to 50% for ‘Off Pos.’ and

-30% to +30% for idle pre-set.

Now it is time to select the transit speed of the throttle servo

when the auto-rotation state is triggered; this is entered in the

‘Speed’ line: mark the appropriate field and use the arrow but-

tons to enter the setting as a numeric value. Please note: the

higher the number, the more slowly the servo moves to its

commanded position. The maximum value (27 increments)

corresponds to a duration of nine seconds.

The process is concluded by assigning an auto-rotation trigger

switch. Mark the field, and the switch select menu appears.

You can now set your preferred switch and its direction of ope-

ration.

In this menu you define the speed at which the throttle servo

moves to its auto-rotation position. This is usually required to

occur quickly, so the setting shown in the screen shot is cor-

rect.

The speed with which the throttle servo takes up the individual

positions in each flight mode is set under ‘Delay’ in the ‘Flight

mode’ menu.

This setting can apply either globally (all flight modes) or for

each flight mode separately.

It is also absolutely essential to activate the Auto-rotation flight

mode in the FLIGHT MODE menu, since that is where you

select the speed at which the system recovers from the auto-

rotation position, e.g. when you switch back to the ‘Aeroba-

tics’ flight mode.

The Download area of the robbe website includes a pre-pro-

grammed model helicopter complete with a description of the

settings.

Please ensure that the Auto-rotation function is switched off

before you attempt to start the motor.

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Robbe Futaba FX-40 Manual

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